Those of you with SLI and Crossfire might want to check out this article.
SLI and CrossFire Push Power Supplies to the Limit
http://www.extremetech.com/article2/0,1697,1932947,00.asp
SLI and CrossFire Push Power Supplies to the Limit
http://www.extremetech.com/article2/0,1697,1932947,00.asp